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The Rinnai Sensei RX199iN is a condensing tankless water heater rated at 199,000 BTU and up to 11 GPM, with 97% efficiency. Its smart gas valve runs on natural gas or propane without a conversion kit, and it heats water only on demand, so there is no tank to run out. The high flow rate suits large homes with several bathrooms running at once. Against other condensing tankless units, it stands out on flow rate and fuel flexibility; owners of Rinnai tankless units generally report steady hot water and long service life, while critics point to the venting and gas-line work a condensing unit needs and to scale buildup in hard water.
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Owners of Rinnai tankless heaters generally praise consistent hot water and durability, and the high flow rate is a common reason to choose this class of unit. Complaints tend to center on installation requirements and mineral scale in hard-water areas.
The Rinnai RX199iN Sensei RX is a condensing tankless water heater for residential use. It heats water only when you need it, so the supply of hot water doesn't run out. It has a maximum flow rate of 11 gallons per minute and a heat output of 199,000 BTU.
It runs on natural gas or propane, and its Smart Sense gas valve adjusts to either fuel, so no gas conversion kit is required. The unit is direct vent, mounts on a wall and is made for indoor installation. Outdoor installation is possible with the Rinnai outdoor vent cap accessory (RXOVC).
The integrated controller is standard. The MC-601 controller is optional. Scheduled recirculation uses the MC-195T-US or the RWM200 Wireless Module. The unit is Wi-Fi ready and is Smart-Circ capable once a pump or pump accessory kit is installed.
